Chemical Engineering Thermodynamics
Which of the following processes can not be made reversible even under ideal condition of operation?

Expansion of steam in a turbine
All of these
Compression of air in a compressor
Free expansion of a gas

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Chemical Engineering Thermodynamics
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

Δ H ≠ 0 and ΔS = 0
Δ H ≠ 0 and ΔS ≠ 0
Δ H = 0 and ΔS = 0
Δ H = 0 and ΔS ≠ 0

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Chemical Engineering Thermodynamics
It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

The amount of work needed is path dependent
More information is needed to conclude anything about the path dependence or otherwise of the work needed
The amount of work needed is independent of path
Work alone can not bring out such a change of state

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